[RE-wrenches] blue planet battery voltage vs SOC

[Nick A Lucchese]

Greetings Jay,

Though the curve is obviously very flat with lithium and not very susceptible to Peukert’s law I do find that the delta between voltage and SOC can very a couple volts depending on how much current is being pushed in or out. But since you asked for a “rough” approximation here is what I observed on a couple systems I’ve got on HBX (while under load or charge).

48vdc seems to be pretty consistent at 5% but drops closer to 47% @ 1C. I just tell my clients it’s time to run the generator or conserve once at 50 or below.
51.2vdc = 21% SOC
51.6vdc = 33% SOC
52% = 45% SOC
Obviously you can see a trend of about 12% for every .4vdc

Of course when we receive a new lot of batteries and first install they are resting at 52.9vdc and are at 85% SOC.
Also, I’ve got a “confidential” document I can send you directly as well.

Good luck, Nick


> On Dec 28, 2022, at 8:54 AM, jay via RE-wrenches <re-wrenches at lists.re-wrenches.org> wrote:
> 
> 
> HI All,
> 
> I’m trying to trouble shoot a remote system and wondering if anyone has a rough volts vs SOC for the the blue planet battery
> 
> 
> 
> thx
> jay
> 
> 
> 
> 
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